Fluid pumping apparatus with two-step load limiting control

Details Fluid pumping apparatus with two-step load limiting control Fluid pumping apparatus with two-step load limiting control

1998-10-01

2000-08-01

Walberg, Teresa

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

4172221, 417218, F04B 126

Patent

active

060957603

ABSTRACT:
A fluid power pumping apparatus having a control system for limiting the power loading thereon to the power available from a motor (172) driving the apparatus, includes a variable displacement rotating piston pump (170). A compensating valve assembly (174) of a type known in the prior art is mounting on the pump. The compensating valve controls flow volume through the pump in response to pressure at an outlet (176) of the compensating valve. The outlet is connected to a variable load limiting control (180). The load limiting control includes a low flow adjustment which varies according to the position of a cam (186) which is connected to the swash plate of the pump, and a high-flow cut-off. The load limiting control reaches higher operating pressures while operating within the power delivery capabilities of the motor. Both the low flow adjustment and high-flow cut-off are manually adjustable to tailor the pump to the operating characteristics of the motor.

REFERENCES:
patent: Re31711 (1984-10-01), Horiuchi
patent: 4275997 (1981-06-01), Woodring et al.
patent: 4285639 (1981-08-01), Woodring et al.
patent: 5123815 (1992-06-01), Larkin et al.
patent: 5183393 (1993-02-01), Schaffner
patent: 5486097 (1996-01-01), Schaffner
patent: 5562424 (1996-10-01), Manring
patent: 5567123 (1996-10-01), Childress et al.
patent: 6033188 (2000-03-01), Baldus et al.

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